First small issue: during the last 2 rides at the exact same spot in my route over rough gravel when the bike shakes, the storage door sprang open and flew away... - No bottle with me each time.
The issue is, that through the rattling, the handle went down, and when the handle is down, it opens.
Fortunately, there seem to be no damage, as it is solid aluminum or metal.
Now, i found you can adjust the tension with a hex key. The tolerance is very exact, like a couple of degrees more or less makes a huge difference for the tension of the handle. I made it much tighter now and hopes that it fixes.
But I think it is not an optimal constructions - A better way would be to make the handle, so it opens when pulling up instead, or some kind of lock on the handle, like a spring, stop, button idk.